CN108834259B - Linear constant current control circuit and method for LED lamp and LED device - Google Patents
Linear constant current control circuit and method for LED lamp and LED device Download PDFInfo
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- CN108834259B CN108834259B CN201810755449.7A CN201810755449A CN108834259B CN 108834259 B CN108834259 B CN 108834259B CN 201810755449 A CN201810755449 A CN 201810755449A CN 108834259 B CN108834259 B CN 108834259B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 34
- 239000010703 silicon Substances 0.000 claims abstract description 34
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000001514 detection method Methods 0.000 claims abstract description 30
- 230000005669 field effect Effects 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims 3
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- 238000010586 diagram Methods 0.000 description 6
- 238000005286 illumination Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention belongs to the technical field of electronic circuits, and provides a linear constant current control circuit and method for an LED lamp and an LED device, wherein the linear constant current control circuit and method are used for performing power compensation on an input linear power grid; when the silicon controlled rectifier dimmer is connected to an alternating current network, constant current is discharged to current flowing through the silicon controlled rectifier dimmer, and meanwhile, when the silicon controlled rectifier detection module detects that the dimmer is connected, corresponding discharge current is disconnected, so that system efficiency is improved. Therefore, when the input voltage of the system changes, the input power is basically kept unchanged, and the constant current output drives the LED lamp, so that the problem that the brightness of the whole lamp can change when the network voltage fluctuates in the existing LED lamp lighting driving technology, and the environment lighting effect is poor is solved.
Description
Technical Field
The invention belongs to the technical field of electronic circuits, and particularly relates to a linear constant current control circuit and method for an LED lamp and an LED device.
Background
In recent years, various driving technologies are layered endlessly with the development of LED lamp lighting technologies, but with the continuous expansion of application fields, requirements for driving are also more and more special, for example: size, conversion efficiency, and other requirements, etc., are subject to corresponding constraints. However, when the voltage of the wire network fluctuates in the existing LED lamp illumination, the brightness of the whole lamp can change, so that the environmental illumination effect is poor.
Disclosure of Invention
The invention aims to provide a linear constant current control circuit, a linear constant current control method and an LED device for an LED lamp, and aims to solve the problem that the brightness of the whole lamp can change when the voltage of a wire network fluctuates in the existing LED lamp lighting driving technology, so that the environment lighting effect is poor.
The first aspect of the present invention provides a linear constant current control circuit for an LED lamp, the linear constant current control circuit comprising:
the wire net compensation module is used for carrying out power compensation on an input linear power grid;
the controllable silicon detection module is used for detecting whether the controllable silicon dimmer is connected or not;
the reference module is connected with the wire mesh compensation module and used for generating a reference voltage value;
the over-temperature module is connected with the reference module and used for reducing the reference voltage value when the detected temperature reaches a preset value;
the bleeder module is connected with the silicon controlled rectifier detection module and the reference module and is used for performing constant current bleeder on current flowing when the linear constant current control circuit is connected with the silicon controlled rectifier dimmer; and
and the constant current driving module is connected with the reference module and used for adjusting the current flowing through the reference module so as to output constant current.
The second aspect of the invention provides an LED device, comprising an ac power supply, a rectifying module for converting an ac signal output by the ac power supply into a dc signal to drive an LED lamp, and a linear constant current control circuit as described above.
The third aspect of the invention provides a linear constant current control method for an LED lamp, which comprises the following steps:
carrying out power compensation on an input linear power grid;
when the detected temperature reaches a preset value, reducing the generated reference voltage value;
when the detection linear constant current control circuit is connected to the silicon controlled rectifier dimmer, constant current is discharged;
the current flowing through is regulated so that a constant current is output.
According to the linear constant current control circuit and method for the LED lamp and the LED device, power compensation is carried out on an input linear power grid; when the silicon controlled rectifier dimmer is connected to an alternating current network, constant current is discharged to current flowing through the silicon controlled rectifier dimmer, and meanwhile, when the silicon controlled rectifier detection module detects that the dimmer is connected, corresponding discharge current is disconnected, so that system efficiency is improved. Therefore, when the input voltage of the system changes, the input power is basically kept unchanged, and the constant current output drives the LED lamp, so that the problem that the brightness of the whole lamp can change when the network voltage fluctuates in the existing LED lamp lighting driving technology, and the environment lighting effect is poor is solved.
Drawings
Fig. 1 is a schematic block diagram of a linear constant current control circuit for an LED lamp according to the present invention.
Fig. 2 is an exemplary circuit diagram of a thyristor detection module and a bleeder module in a linear constant current control circuit for an LED lamp provided by the present invention.
Fig. 3 is an exemplary circuit diagram of a linear constant current control circuit wire mesh compensation module and a constant current driving module for an LED lamp provided by the present invention.
Fig. 4 is a schematic diagram of a working current waveform of a linear constant current control circuit for an LED lamp according to the present invention without a thyristor dimmer.
Fig. 5 is a schematic diagram of a working current waveform of a silicon controlled rectifier connected to a linear constant current control circuit for an LED lamp according to the present invention.
Fig. 6 is an exemplary circuit diagram of a reset circuit in the corresponding thyristor detection module of fig. 2.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
According to the linear constant current control circuit and method for the LED lamp and the LED device, the constant current and constant power control technology is adopted, and the output current is controlled by detecting the VT port voltage, so that the input power is basically kept unchanged when the input voltage is changed; meanwhile, the voltage of the TRIAC port is detected to control the discharge current, so that the TRIAC port is closed when the silicon controlled rectifier dimmer is not connected to the system; when the thyristor dimmer is connected to the system, the TRIAC port is normally opened. The linear constant current control circuit has an over-temperature adjusting function, and reduces output current when the temperature is over-high, so that the application reliability of the system is improved. The invention provides a mode for compensating the wire mesh voltage, and solves the problems of the existing LED lamp illumination driving technology.
Fig. 1 shows a block structure of a linear constant current control circuit for an LED lamp provided by the present invention, and for convenience of explanation, only the portions related to the present embodiment are shown, and detailed below:
the linear constant current control circuit for the LED lamp comprises a wire mesh compensation module 101, a silicon controlled rectifier detection module 104, a reference module 102, an over-temperature module 103, a discharge module 105 and a constant current driving module 106.
The wire net compensation module 101 is used for performing power compensation on an input linear power grid.
The scr detection module 104 is configured to detect whether a scr dimmer is connected.
The reference block 102 is connected to the net compensation block 101 for generating a reference voltage value.
The over-temperature module 103 is connected with the reference module 102 and is used for reducing the reference voltage value when the detected temperature reaches a preset value.
The bleeder module 105 is connected with the thyristor detection module 104 and the reference module 102, and is used for performing constant current bleeder on the current flowing through when the linear constant current control circuit is connected with the thyristor dimmer.
A constant current drive module 106 is connected to the reference module 102 for regulating the current flowing therethrough such that a constant current is output.
As an embodiment of the present invention, the linear constant current control circuit further includes:
and the power supply conversion module 107 is connected with the thyristor detection module 104 and the bleeder module 105 and is used for supplying power to the linear constant current control circuit after the voltage of the accessed reference power supply VDD is converted.
Fig. 2 shows an exemplary circuit of a thyristor detection module and a bleeder module in a linear constant current control circuit for an LED lamp, and for convenience of explanation, only the portions related to the present embodiment are shown, and the details are as follows:
as an embodiment of the present invention, the scr detection module 104 includes a first resistor R1, a second resistor R2, a first comparator U1, a second comparator U2, a delay unit, and a logic control unit, and the scr detection module 104 may further include a reset circuit.
The first end of the first resistor R1 is an input end of the controllable silicon detection module 104, the second end of the first resistor R1 is commonly connected with the first end of the second resistor R2, the inverting input end of the first comparator U1 and the non-inverting input end of the second comparator U2, the second end of the second resistor R2 is grounded, the output end of the first comparator U1 is connected with the input end of the delay unit, the output end of the delay unit is connected with the input end of the logic control unit, the output end of the second comparator U2 is connected with the controlled end of the logic control unit, the output end of the logic control unit is the output end of the controllable silicon detection module 104, and the output end of the reset circuit is connected with the input end of the logic control unit.
As an embodiment of the present invention, the bleeder module 105 includes a third comparator U3 and a second switching tube Q2.
The non-inverting input end of the third comparator U3 is connected with the reference module 102, the output end of the third comparator U3 is connected with the controlled end of the second switching tube Q2, the input end of the second switching tube Q2 is the input end of the bleeder module 105, and the inverting input end of the third comparator U3 is connected with the output end of the second switching tube Q2 in a sharing way and is used as the output end of the bleeder module 105.
Specifically, the second switching transistor Q2 is a field effect transistor or a triode;
the grid electrode, the drain electrode and the source electrode of the field effect transistor are respectively a controlled end, an input end and an output end of the second switching tube Q2;
the base, collector and emitter of the triode are the controlled end, input end and output end of the second switch tube Q2 respectively.
Fig. 3 shows an example circuit of the linear constant current control circuit net compensation module and the constant current driving module for the LED lamp provided by the present invention, and for convenience of explanation, only the parts related to the present embodiment are shown, and the details are as follows:
as an embodiment of the invention, the net compensation module 101 includes a zener diode VZ, a third resistor R3, a fourth resistor R4, a third switching tube Q3, a fourth comparator U4 and a fifth comparator U5.
The cathode of the zener diode VZ is commonly connected with the non-inverting input end of the fourth comparator U4 and is used as the input end of the wire mesh compensation module 101, the anode of the zener diode VZ is grounded, the output end of the fourth comparator U4 is connected with the controlled end of the third switching tube Q3, the input end of the third switching tube Q3 is connected with the reference voltage add, the inverting input end of the fourth comparator U4 is commonly connected with the output end of the third switching tube Q3 and the first end of the third resistor R3, the second end of the third resistor R3 is commonly connected with the first end of the fourth resistor R4 and the inverting input end of the fifth comparator U5, and the second end of the fourth resistor R4 is connected with the output end of the fifth comparator U5.
Specifically, the third switching transistor Q3 is a field effect transistor or a triode;
the grid electrode, the drain electrode and the source electrode of the field effect transistor are respectively a controlled end, an input end and an output end of the third switching tube Q3;
the base, collector and emitter of the triode are the controlled end, input end and output end of the third switching tube Q3 respectively.
As an embodiment of the present invention, the constant current driving module 106 includes a sixth comparator U6 and a first switching transistor Q1.
The non-inverting input end of the sixth comparator U6 is connected with the reference module 102, the output end of the sixth comparator U6 is connected with the controlled end of the first switching tube Q1, the input end of the first switching tube Q1 is the input end of the constant current driving module 106, and the inverting input end of the sixth comparator U6 is connected with the output end of the first switching tube Q1 in a sharing way and is used as the output end of the constant current driving module 106.
Specifically, the first switching transistor Q1 is a field effect transistor or a triode;
the grid electrode, the drain electrode and the source electrode of the field effect transistor are respectively a controlled end, an input end and an output end of the first switch tube Q1;
the base, collector and emitter of the triode are the controlled end, input end and output end of the first switch tube Q1 respectively.
The following describes the working principle of the wire mesh compensation module and the constant current driving module in the linear constant current control circuit for the LED lamp with reference to fig. 3 as follows:
detecting the change of the input voltage through the VT port, and reducing the input current when the input voltage rises; when the input voltage is reduced, the input current is increased, so that the input power of the system is not changed along with the fluctuation of the input line network voltage.
When VT is less than Verf, the OUT port is turned on at constant current (denoted by T1 in fig. 4); when VT is greater than Verf and less than VZ, the OUT port current decreases as VT increases (denoted by T2 in fig. 4); when VT is greater than VZ, VT is clamped and the OUT port is turned on at a constant current (denoted by T3 in fig. 4).
The invention also provides an LED device which comprises an alternating current power supply, a rectifying module and a linear constant current control circuit, wherein the rectifying module is used for converting an alternating current signal output by the alternating current power supply into a direct current signal so as to drive an LED lamp.
When the TRIAC port reaches the working voltage of the linear constant current control circuit, the circuit is started, the voltage of the TRIAC port is detected to control the discharge current, and when no silicon controlled rectifier dimmer is connected to the system, and when the voltage of the TRIAC port is larger than the preset voltage of the linear constant current control circuit, the TRIAC port is closed; when the thyristor dimmer is connected to the system, the TRIAC port is normally opened. The output current of the OUT port is controlled by detecting the voltage of the VT port, so that when the voltage of the online network is increased, the output current is reduced, and the efficiency is improved; and the input power remains substantially unchanged as the input voltage changes. Wherein the REXT1 and REXT2 resistors set the currents of the TRIAC port and the OUT port, respectively.
Fig. 4 and fig. 5 respectively show waveforms of working currents of a non-connected scr dimmer and a connected scr dimmer in a linear constant current control circuit for an LED lamp provided by the present invention, and with reference to fig. 2, working principles of a scr detection module and a bleeder module in the linear constant current control circuit for an LED lamp are described as follows:
and the silicon controlled rectifier is not connected:
V TRIAC and when the partial pressure is smaller than V1, the TRIAC port is opened and the detection is continued. When V is TRIAC When the partial pressure is greater than V1, detecting V in the delay time TRIAC And when the partial pressure is smaller than V2, closing the TRIAC port until each line network period is finished.
And accessing a silicon controlled rectifier:
and (3) opening control: v (V) TRIAC And when the partial pressure is smaller than V1, the TRIAC port is opened and the detection is continued. When V is TRIAC When the partial pressure is greater than V1, detecting V in the delay time TRIAC And when the partial pressure is greater than V2, normally opening the TRIAC port until each net period is finished.
And (3) switching off control: when the REXT1 port voltage is greater than Vrext2, the third comparator U3 is turned off, outputting a low level, the TRIAC port is turned off until the REXT1 port voltage is less than Vrext2, and the TRIAC port is turned back on until the end of each net period is reset.
Or off control: when the REXT1 port voltage is greater than Vrext2, the third comparator U3 is turned off, outputting a low level, and the TRIAC port is turned off until the end of each net cycle is reset.
Fig. 6 shows an example circuit of a reset circuit in the thyristor detection module, and for convenience of explanation, only a portion related to the present embodiment is shown, as follows:
as an embodiment of the present invention, the reset circuit can turn off the discharging current at time T4 in FIG. 5 to increase the power efficiency.
The invention also provides an LED device which comprises an alternating current power supply, a rectifying module and a linear constant current control circuit, wherein the rectifying module is used for converting an alternating current signal output by the alternating current power supply into a direct current signal so as to drive an LED lamp.
The invention also provides a linear constant current control method for the LED lamp, which comprises the following steps:
A. carrying out power compensation on an input linear power grid;
B. when the detected temperature reaches a preset value, reducing the generated reference voltage value;
C. when the detection linear constant current control circuit is connected to the silicon controlled rectifier dimmer, constant current is discharged;
D. the current flowing through is regulated so that a constant current is output.
As an embodiment of the present invention, the above linear constant current control method further includes:
and when the linear constant current control circuit is detected to be not connected to the silicon controlled rectifier dimmer, the linear constant current control circuit is turned off.
In summary, the linear constant current control circuit, the method and the LED device for the LED lamp provided by the embodiment of the invention perform power compensation on an input linear power grid; when the silicon controlled rectifier dimmer is connected to an alternating current network, constant current is discharged to current flowing through the silicon controlled rectifier dimmer, and meanwhile, when the silicon controlled rectifier detection module detects that the dimmer is connected, corresponding discharge current is disconnected, so that system efficiency is improved. Therefore, when the input voltage of the system changes, the input power is basically kept unchanged, and the constant current output drives the LED lamp, so that the problem that the brightness of the whole lamp can change when the network voltage fluctuates in the existing LED lamp lighting driving technology, and the environment lighting effect is poor is solved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. A linear constant current control circuit for an LED lamp, the linear constant current control circuit comprising:
the wire net compensation module is used for carrying out power compensation on an input linear power grid;
the controllable silicon detection module is used for detecting whether the controllable silicon dimmer is connected or not;
the reference module is connected with the wire mesh compensation module and used for generating a reference voltage value;
the over-temperature module is connected with the reference module and used for reducing the reference voltage value when the detected temperature reaches a preset value;
the bleeder module is connected with the silicon controlled rectifier detection module and the reference module and is used for performing constant current bleeder on current flowing when the linear constant current control circuit is connected with the silicon controlled rectifier dimmer; and
the constant current driving module is connected with the reference module and used for adjusting the current flowing through the reference module so as to output constant current;
the silicon controlled rectifier detection module comprises a reset circuit.
2. The linear constant current control circuit of claim 1, wherein the linear constant current control circuit further comprises:
and the power supply conversion module is connected with the silicon controlled rectifier detection module and the bleeder module and is used for supplying power to the linear constant current control circuit after voltage conversion is performed on the accessed reference power supply.
3. The linear constant current control circuit of claim 1, wherein the thyristor detection module further comprises:
the device comprises a first resistor, a second resistor, a first comparator, a second comparator, a delay unit and a logic control unit;
the first end of the first resistor is the input end of the silicon controlled rectifier detection module, the second end of the first resistor is commonly connected with the first end of the second resistor, the inverting input end of the first comparator and the non-inverting input end of the second comparator, the second end of the second resistor is grounded, the output end of the first comparator is connected with the input end of the delay unit, the output end of the delay unit is connected with the input end of the logic control unit, the output end of the second comparator is connected with the controlled end of the logic control unit, and the output end of the logic control unit is the output end of the silicon controlled rectifier detection module.
4. The linear constant current control circuit of claim 1, wherein the bleed module comprises:
a third comparator and a second switching tube;
the non-inverting input end of the third comparator is connected with the reference module, the output end of the third comparator is connected with the controlled end of the second switching tube, the input end of the second switching tube is the input end of the bleeder module, and the inverting input end of the third comparator is connected with the output end of the second switching tube in a sharing way and is used as the output end of the bleeder module.
5. The linear constant current control circuit of claim 1, wherein the net compensation module comprises:
the voltage stabilizing diode, the third resistor, the fourth resistor, the third switching tube, the fourth comparator and the fifth comparator;
the cathode of the voltage stabilizing diode is commonly connected with the positive input end of the fourth comparator and is used as the input end of the wire mesh compensation module, the anode of the voltage stabilizing diode is grounded, the output end of the fourth comparator is connected with the controlled end of the third switching tube, the negative input end of the fourth comparator is commonly connected with the output end of the third switching tube and the first end of the third resistor, the second end of the third resistor is commonly connected with the first end of the fourth resistor and the negative input end of the fifth comparator, and the second end of the fourth resistor is connected with the output end of the fifth comparator.
6. The linear constant current control circuit according to claim 1, wherein the constant current driving module includes:
a sixth comparator and a first switching tube;
the positive-phase input end of the sixth comparator is connected with the reference module, the output end of the sixth comparator is connected with the controlled end of the first switching tube, the input end of the first switching tube is the input end of the constant current driving module, and the negative-phase input end of the sixth comparator is connected with the output end of the first switching tube in a sharing way and is used as the output end of the constant current driving module.
7. The linear constant current control circuit according to claim 6, wherein the first switching transistor is a field effect transistor or a triode;
the grid electrode, the drain electrode and the source electrode of the field effect tube are respectively a controlled end, an input end and an output end of the first switch tube;
the base electrode, the collector electrode and the emitter electrode of the triode are respectively a controlled end, an input end and an output end of the first switching tube.
8. An LED device comprising an ac power source, a rectifying module for converting an ac signal outputted from the ac power source into a dc signal to drive an LED lamp, characterized in that the LED device further comprises a linear constant current control circuit according to any one of claims 1 to 7.
9. The linear constant current control method for the LED lamp is characterized by comprising the following steps of:
carrying out power compensation on an input linear power grid;
when the detected temperature reaches a preset value, reducing the generated reference voltage value;
when the detection linear constant current control circuit is connected to the silicon controlled rectifier dimmer, constant current is discharged;
the current flowing through is regulated so that a constant current is output.
10. The linear constant current control method according to claim 9, characterized in that the linear constant current control method further comprises:
and when the linear constant current control circuit is detected to be not connected to the silicon controlled rectifier dimmer, the linear constant current control circuit is turned off.
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| CN201810755449.7A CN108834259B (en) | 2018-07-11 | 2018-07-11 | Linear constant current control circuit and method for LED lamp and LED device |
| US16/110,403 US10375775B1 (en) | 2018-07-11 | 2018-08-23 | Circuit and method for linear constant current control and LED device |
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| CN201810755449.7A CN108834259B (en) | 2018-07-11 | 2018-07-11 | Linear constant current control circuit and method for LED lamp and LED device |
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| CN107645804A (en) | 2017-07-10 | 2018-01-30 | 昂宝电子（上海）有限公司 | System for LED switch control |
| CN108200685B (en) | 2017-12-28 | 2020-01-07 | 昂宝电子（上海）有限公司 | LED lighting system for silicon controlled switch control |
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| CN109922564B (en) | 2019-02-19 | 2023-08-29 | 昂宝电子（上海）有限公司 | Voltage conversion system and method for TRIAC drive |
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| CN111031635B (en) | 2019-12-27 | 2021-11-30 | 昂宝电子（上海）有限公司 | Dimming system and method for LED lighting system |
| CN111432526B (en) | 2020-04-13 | 2023-02-21 | 昂宝电子（上海）有限公司 | Control system and method for power factor optimization of LED lighting systems |
| CN113364259B (en) * | 2021-06-11 | 2022-08-19 | 深圳市费思泰克科技有限公司 | Constant-current bleeder circuit with time-delay turn-off protection |
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